Based on the analysis and comparing of advantages and disadvantages of various machining process of small holes,a numerical control (NC) electrochemical machining (ECM) machine tool with three axes by using tubular electrode to machine small holes was designed and developed,which was directed against the structure of common small holes of the aircraft engine.The machine tool was included of parts of machine tools feeding system,circulating system of electrolyte and control system,and etc.Finally,the machining reliability and stability of machine tool is verified through the experimental machining of small holes of hightemperature nickelbased alloys Inconel718. 